Brad Pitt's upcoming zombie flick World War Z is "a nightmare from top to bottom," a source tells The Hollywood Reporter.

The movie, which already has racked up a cost of $170 million, is suffering from a "lack of clear creative direction." Pitt's movie also needs five more weeks of complex reshoots which won't take place until September.

Here are few more issues with the big budget film:

- The release date has been pushed from December 2012 to June 2013

- Paramount has hired Prometheus scriptwriter Damon Lindelof to rework World War Z's third act